NET is lower than goal...good or bad?!

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My NET at the end of the day is generally alot lower than my goal? Is this a good thing?

I generally put in everything I have eaten then put in my exercise for that day at which point it gives me more calories which I ignore as i don't think beacuse I've done exercise I should eat more

I'm getting really confused with what the NET actually means as other sites seem to suggest that it is the same as your deficit?

Help please?!

Laura x